Full list of all 15 Sonic Adventure 2 achievements worth 500 gamerscore. It takes around 35-40 hours to unlock all of the achievements in the base game.
The base game contains 12 achievements worth 400 Gamerscore, and there is 1 DLC pack containing 3 achievements worth 100 Gamerscore.
Clear stage 1 on either side in story mode.
Name your Chao for the first time.
Raise all 5 properties of any one Chao up to level 10.
Clear HERO side in story mode.
Clear DARK side in story mode.
Clear all 3 modes in Boss Attack Mode.
Win all A RANKs (5 A RANKs) in any one stage in story mode.
Raise a HERO Chao and a DARK Chao with your hero and dark characters respectively.
Clear LAST part in story mode.
Win NO.1 in expert level in kart race.
Unlock 90 emblems.
Win A RANK in all stages in Story Mode.
Beat all your enemies in Super Level in Chao Karate 1P mode.
Play all level 4 stages in Action Race, Treasure Hunter and Shooting Battle.
Unlock all 180 emblems.